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首页> 外文期刊>Progress in Natural Science: Communication of State Key Laboratories of China >A new simulated annealing method of designing NMR biplanar shim coils
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A new simulated annealing method of designing NMR biplanar shim coils

机译：设计核磁共振双平面匀场线圈的一种新的模拟退火方法

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摘要

A new SA (simulated annealing) method is presented for the design of longitudinal shim coils for NMR (nuclear magnetic resonance) equipment. First, AGL (adaptive Gauss-Lobatto) quadrature used by the traditional SA method is analyzed. Two kinds of complete elliptic integrals are introduced to integrate the spatial magnetic field, which increases the computing speed by 13. 3 times. Then, the system energy calculation is extended to the field of the 2-axis. The results illustrate that the coil-set efficiency designed by the new SA method is 15% higher than that of the traditional one, and the field inhomogeneity is reduced from 1.20% to 0.49% . Finally, a prototype of coil assembly for NMR rock-core analyzer is built, and the experimental results arein good agreement with the theoretically calculated results.
机译：提出了一种新的SA（模拟退火）方法，用于NMR（核磁共振）设备的纵向匀场线圈的设计。首先，分析了传统SA方法使用的AGL（自适应高斯-洛巴托）正交。引入了两种完整的椭圆积分来积分空间磁场，从而使计算速度提高了13倍。然后，系统能量计算扩展到2轴领域。结果表明，新的SA方法设计的线圈组效率比传统方法高15％，场不均匀性从1.20％降低到0.49％。最后，建立了核磁共振岩心分析仪线圈组件的原型，实验结果与理论计算结果吻合良好。

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